Fractions with Money and Clocks

Solve 2/3 + 1/12

• 8/12 + 1/12 = 9/12

• 9/12 + 1/12 = 9/12

• 5/12 + 1/12 = 6/12

• 6/12 + 1/12 = 7/12

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CCSS.3.NF.A.1

CCSS.3.NF.A.3

Explain why we used clocks to solve 2/3 + 1/12

Answer explanation

We used clocks because the denominator in the second fraction was 12.

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CCSS.5.NF.A.1

CCSS.5.NF.A.2

When thinking of MONEY 1/4 equals

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CCSS.2.MD.C.8

When adding 1/4 + 3/5 I think of

• Money

• Clocks

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CCSS.4.NF.C.5

Solve 1/4 + 3/5 using MONEY

• 50/100 + 75/100 = 125/100

• 25/100 + 30/100 = 55/100

• 25/100 + 60/100 = 85/100

• $0.25 + $0.60 = $0.85

Tags

CCSS.4.MD.A.2

CCSS.4.NF.C.6

Why did we use money to solve 1/4 + 3/5?

Answer explanation

We used money because 5 and 4 are factors of 100.

Tags

CCSS.4.MD.A.2

CCSS.4.NF.C.5

For 2/3 + 1/12 would use the money model or the clock model?

• Money

• Clocks

Tags

CCSS.4.NF.C.5